package com.example.lib_data.bmob

class MusicManager private constructor(){
    private var mMusics = emptyList<Song>()
    companion object{
        val instance = MusicManager()
    }

    fun getMusics() = mMusics

    /**
     * 加载音乐数据
     */
    fun loadMusics(onStart:()->Unit,callBack:(List<Song>)->Unit){
        BmobManager.getInstance().queryMusics(
            onStart = { onStart()},
            onEnd = { songs:List<Song>? ->
                songs?.let{
                    mMusics = it
                    callBack(it)
                    return@queryMusics
                }
                callBack(emptyList())
            }
        )
    }
}